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PTC has created an excellent eBook on Direct Modeling: 5 Ways You Can Benefit from the Simplicity of Direct Modeling. The eBook can be downloaded here:
http://www.ptc.com/products/creo-elements-direct/ebooks/3d-cad-ease-of-use/
And here is a direct link: http://www.ptc.com/WCMS/files/124006/en/6240_DirectModel_eBook3_EN.pdf